CN112964212A - Coating thickness detector and coating thickness detection method - Google Patents
Coating thickness detector and coating thickness detection method Download PDFInfo
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- CN112964212A CN112964212A CN202110336459.9A CN202110336459A CN112964212A CN 112964212 A CN112964212 A CN 112964212A CN 202110336459 A CN202110336459 A CN 202110336459A CN 112964212 A CN112964212 A CN 112964212A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/02—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness
- G01B21/08—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness for measuring thickness
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Abstract
The invention discloses a coating thickness detector and a coating thickness detection method. The coating thickness detector provided by the invention is provided with a plurality of measuring bodies which are arranged in a line, and the coating area can be detected in a large range after the probe moves, so that the conventional mode of measuring the coating thickness by a single point is changed, and the measuring result is closer to the real condition. The method for inspecting the coating thickness guides the measurement data into the three-dimensional coordinate system for analysis, can accurately and intuitively reflect the difference between the measured coating thickness and the designed coating thickness, and improves the inspection efficiency and the inspection accuracy of the coating thickness.
Description
Technical Field
The invention relates to the technical field of coating detection, in particular to a coating thickness detector and a coating thickness detection method.
Background
The existing nondestructive coating thickness measuring instrument is designed and manufactured by using principles such as ultrasonic waves, magnetic attraction, magnetic induction and the like, has good precision and accuracy, but has an obvious defect of single-point measurement.
The single-point measurement, that is, the measurement is a thickness of one point, because the surface of the steel has roughness (generally 20 to 80 μm), when the thickness of the coating is small (for example, 50 μm), because the height difference between the pits and the protrusions on the surface of the steel is equivalent to the thickness of the coating, the measured data has large fluctuation, and even if the surface of the coating is completely flat, the data has a fluctuation range of about 60 μm, and obviously, the measurement result does not really reflect the condition of the coating thickness.
Due to the limitations of measuring instruments and measuring methods, one surface or even one coating thickness representing a complex structure is represented by one or more groups of single-point measured data, and obviously has certain distortion. In order to meet the requirement of the coating thickness on the basis of the existing measurement result, the phenomenon that the coating part area is excessively thick inevitably exists, so that the coating is wasted.
Disclosure of Invention
The invention aims to provide a coating thickness detector and a coating thickness detection method, which have high accuracy and can measure the actual thickness of a coating.
In order to achieve the purpose, the invention adopts the following technical scheme:
on the one hand, provide a coating thickness detector, including the probe, the probe includes colloid, displacement sensor and a plurality of measurement body, the measurement body with displacement sensor all sets up on the colloid, the measurement body is the word arrangement, the measurement body is used for detecting the thickness of coating, displacement sensor is used for detecting the displacement size that the measurement body takes place.
As a preferable scheme of the invention, the coating thickness detector further comprises a shell, a connecting wire, a display screen, a data wire and a circuit board, wherein the circuit board is arranged inside the shell, the probe is connected with the circuit board through the connecting wire, the display screen is arranged on the surface of the shell, the data wire is connected with the circuit board and penetrates out of the shell, and a containing groove for placing the probe is formed in the shell.
As a preferable mode of the present invention, the number of the measuring bodies is five.
On the other hand, the method for inspecting the coating thickness by using the coating thickness detector in any technical scheme comprises the following steps:
s1, enabling the probe to contact the surface of a coating, moving the probe, measuring the thickness of the coating once per unit distance of movement of each measuring body, generating a data point, forming a group of measuring data by all the data points generated by each measuring body, and enabling the surface area of the coating passed by the probe to be a measuring band;
s2, establishing a three-dimensional coordinate system, inputting measurement data generated by each measurement body into the three-dimensional coordinate system, wherein the X axis of the three-dimensional coordinate system is used for expressing the displacement of the measurement body, the measurement data of each measurement body are arranged at equal intervals along the Y axis direction, the Z axis is used for expressing the value of the coating thickness measured by the measurement body, connecting each group of measurement data, and generating a curved surface reflecting the coating thickness in the three-dimensional coordinate system;
and S3, introducing a first plane representing the designed thickness of the coating into the three-dimensional coordinate system, calculating the number of data points below the first plane, and judging whether the thickness of the coating is qualified.
As a preferred embodiment of the present invention, after step S3, the area S of the orthographic projection of the curved surface on the XY plane is calculated, the volume V directly under the curved surface is calculated, the average thickness D of the coating layer is obtained as V/S, and the value of D is compared with the designed thickness of the coating layer.
As a preferable aspect of the present invention, after step S3, at least one second plane is introduced into the three-dimensional coordinate system, the second plane is parallel to the first plane, the second plane is located below or above the first plane, the number of data points located above and/or below the second plane is calculated, and whether the thickness of the coating is acceptable or not is determined.
In a preferred embodiment of the present invention, the distance from the second plane to the XY plane is three-thirds of the distance from the first plane to the XY plane.
In a preferred embodiment of the present invention, the number of the measuring strips is determined according to the area of the inspection region, and the number of the measuring strips is at least two.
As a preferred scheme of the invention, if the data of one measuring belt is unqualified in the same inspection area, different positions are selected in the inspection area for re-measurement, and if the re-measured data still shows unqualified, the coating thickness of the inspection area is judged to be unqualified and needs to be processed; if the re-measured data shows that the coating thickness in the inspection area is qualified, judging that the coating thickness in the inspection area is qualified; and if the data of two or more than two measuring belts are unqualified in the same inspection area, directly judging that the coating thickness of the inspection area is unqualified.
In a preferred embodiment of the present invention, the length of the measuring strip is one meter, and the distance between two adjacent data points in the measurement data is 1 to 5 mm.
The invention has the beneficial effects that:
the coating thickness detector provided by the invention is provided with a plurality of measuring bodies which are arranged in a line, and the coating area can be detected in a large range after the probe moves, so that the conventional mode of measuring the coating thickness by a single point is changed, and the measuring result is closer to the real condition. The method for inspecting the coating thickness guides the measurement data into the three-dimensional coordinate system for analysis, can accurately and intuitively reflect the difference between the measured coating thickness and the designed coating thickness, and improves the inspection efficiency and the inspection accuracy of the coating thickness.
Drawings
FIG. 1 is a schematic perspective view of a coating thickness detector according to an embodiment of the present invention;
FIG. 2 is an enlarged view taken at A in FIG. 1;
FIG. 3 is a schematic diagram of the measurement data of each measurement object after being input into a three-dimensional coordinate system according to an embodiment of the present invention;
FIG. 4 is a graph showing the relationship between the thickness of the coating layer measured by the measuring body and the displacement of the measuring body according to one embodiment of the present invention.
In the figure:
1. a probe; 11. a colloid; 12. a measuring body; 13. a displacement sensor; 2. a housing; 20. a receiving groove; 3. a connecting wire; 4. a display screen; 5. a data line; 100. a curved surface; 200. a first plane; 300. coating thickness profile; 400. the coating is designed with a thickness reference line.
Detailed Description
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the word "over" a first feature or feature in a second feature may include the word "over" or "over" the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature "under" a second feature may include a first feature that is directly under and obliquely under the second feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
As shown in fig. 1 and 2, the coating thickness measuring apparatus of an embodiment includes a probe 1, the probe 1 includes a colloid 11, five measuring bodies 12 and a displacement sensor 13, the measuring bodies 12 and the displacement sensor 13 are disposed on the colloid 11, the five measuring bodies 12 are arranged in a line, the measuring bodies 12 are used for detecting the thickness of the coating, and the displacement sensor 13 is used for detecting the displacement of the measuring bodies 12.
The coating thickness detector of the embodiment is provided with five measuring bodies 12 which are arranged in a line, the probe 1 can detect the coating area in a large range after moving, and the existing mode of measuring the coating thickness by a single point is changed, so that the measuring result is closer to the real situation. The colloid 11 provides protection for the measuring body 12 and the displacement sensor 13, and an operator can hold the colloid 11 by hands and then move the probe 1 so that the probe 1 can detect the coating.
In the embodiment, the number of the measuring bodies 12 is preferably five, but the number of the measuring bodies 12 is not limited to five, the number of the measuring bodies 12 is not less than three, and the larger the number of the measuring bodies 12 is, the closer the measuring result is to the real situation, but the cost of the coating thickness detector is increased.
Further, coating thickness detector still includes casing 2, connecting wire 3, display screen 4, data line 5 and circuit board (not shown in the figure), and the circuit board setting is inside casing 2, and probe 1 passes through connecting wire 3 and is connected with the circuit board, and display screen 4 sets up on 2 surfaces of casing, and data line 5 is connected with the circuit board and wears out casing 2, offers on casing 2 to be used for placing accommodating groove 20 of probe 1. The data line 5 can lead measured data into other equipment for data analysis, and can also be used for charging the coating thickness detector, and the probe 1 can be placed in the accommodating groove 20, so that the probe 1 is prevented from being damaged when not in use.
As shown in fig. 3, an embodiment of the present invention further provides a method for inspecting a coating thickness by using the coating thickness detector of the above embodiment, including the following steps:
s1, enabling a probe 1 to contact the surface of a coating, moving the probe 1, measuring the thickness of the coating once every unit distance of each measuring body 12 moves, generating a data point, forming a group of measuring data by all the data points generated by each measuring body 12, and enabling the surface area of the coating passed by the probe 1 to be a measuring band;
s2, establishing a three-dimensional coordinate system, inputting measurement data generated by each measurement body 12 into the three-dimensional coordinate system, wherein the X axis of the three-dimensional coordinate system is used for expressing the displacement of the measurement body 12, the measurement data of each measurement body 12 are arranged at equal intervals along the Y axis direction, the Z axis is used for expressing the numerical value of the coating thickness measured by the measurement body 12, connecting each group of measurement data, and generating a curved surface 100 reflecting the coating thickness in the three-dimensional coordinate system;
and S3, introducing a first plane 200 representing the designed thickness of the coating into the three-dimensional coordinate system, calculating the number of data points below the first plane 200, and judging whether the thickness of the coating is qualified.
As shown in fig. 4, a group of measurement arrays generated by one measurement body 12 forms a coating thickness curve 300 on the XZ plane, the coating thickness curve 300 is formed by connecting data points, and by comparing the positional relationship between the coating thickness curve 300 and a coating design thickness datum line 400, it can be intuitively and quickly determined whether the coating area thickness detected by the current measurement body 12 is qualified. After the Y axis is introduced, the measurement data generated by the plurality of measurement bodies 12 can be displayed and analyzed together in a three-dimensional space, and the analysis efficiency is high and more intuitive. The XY plane can be considered as the surface of a material covered with a coating material such as steel.
The method for inspecting the coating thickness of the embodiment introduces the measurement data into the three-dimensional coordinate system for analysis, can accurately and intuitively reflect the difference between the measured coating thickness and the designed coating thickness, and improves the inspection efficiency and the inspection accuracy of the coating thickness. In general, the thickness of the current coating region can be determined to be acceptable when the number of data points lying below the first plane 200 is a small proportion (e.g., less than 10% or 15%) of the total data points.
Further, after step S3, an area S of the curved surface 100 projected on the XY plane is calculated, a volume V directly under the curved surface 100 is calculated, an average thickness D of the coating layer is obtained as V/S, and D is compared with the designed thickness of the coating layer. The average thickness of the coating can be calculated to reflect the thickness condition of the current coating from another aspect, so that whether the amount of the coating is proper or not can be inversely calculated, and the construction quality is improved.
In some embodiments, after step S3, at least one second plane (not shown) is introduced into the three-dimensional coordinate system, the second plane is parallel to the first plane 200, the second plane is located below the first plane 200 or above the first plane 200, the number of data points located above and/or below the second plane is counted, and whether the thickness of the coating is acceptable or not is determined. Under certain stricter construction standards, stricter requirements are made on the minimum thickness and the maximum thickness of the coating, even if the average thickness of the coating meets the requirements, the quality of the coating is still judged to be unqualified as long as an area with an excessively thin or thick coating exists, therefore, a second plane is required to be introduced into a three-dimensional coordinate system and represents the allowable minimum thickness or maximum thickness of the coating, and whether a data point which does not meet the requirements can be intuitively found by comparing the position relationship between the curved surface 100 and the second plane.
Of course, the second plane is not limited to represent the minimum thickness or the maximum thickness of the coating layer, and may be any value to reflect the current coating thickness. In a specific embodiment, the distance from the second plane to the XY plane is three-half of the distance from the first plane 200 to the XY plane, that is, the second plane represents one fifth of the designed thickness of the coating, and by comparing the position relationship between the curved surface 100 and the second plane, the difference between the thickness of the curved surface 100 and the one fifth of the designed thickness of the coating can be determined, so as to provide a reference for the amount of the coating.
Preferably, the number of measuring strips is determined by the area of the examination area, and the number of measuring strips is at least two. The larger the area of the inspection area is, the more the number of the measuring strips is, so that the real thickness of the coating in the inspection area can be reflected more accurately, and errors are reduced.
Further, if the data of one measuring belt is unqualified in the same inspection area, selecting different positions in the inspection area for re-measurement, and if the re-measured data still shows unqualified, judging that the coating thickness of the inspection area is unqualified and needing to be processed; if the re-measured data shows that the coating thickness in the inspection area is qualified; and if the data of two or more than two measuring belts are unqualified in the same inspection area, directly judging that the coating thickness of the inspection area is unqualified.
Preferably, the length of the measuring band is one meter, the distance between two adjacent data points in the measurement data of one measuring body 12 is 1 to 5 mm, the length of the measuring band is set to one meter in consideration of the length of the arm of the human body, an operator can stand at the same place to complete the sampling operation of the corresponding area of one measuring band, the operator does not need to measure while walking, the distance between two adjacent data points in the measurement data is not too large, so that the number of generated data points is too small, and more data points can make the curved surface 100 smooth, thereby more accurately reflecting the real condition of the coating thickness.
Reference throughout this specification to the description of the terms "preferred," "further," or the like, as used in describing preferred embodiments of the present invention, means that a particular feature, structure, material, or characteristic described in connection with the example or illustration is included in at least one example or illustration of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above examples are only intended to illustrate the details of the invention, which is not limited to the above details, i.e. it is not intended that the invention must be implemented in such detail. It should be understood by those skilled in the art that any modification of the present invention, equivalent substitutions of the raw materials of the product of the present invention, addition of auxiliary components, selection of specific modes, etc., are within the scope and disclosure of the present invention.
Claims (10)
1. The utility model provides a coating thickness detector, its characterized in that, includes the probe, the probe includes colloid, displacement sensor and a plurality of measurement body, the measurement body with displacement sensor all sets up on the colloid, the measurement body is the word arrangement, the measurement body is used for detecting the thickness of coating, displacement sensor is used for detecting the displacement size that the measurement body takes place.
2. The coating thickness detector according to claim 1, wherein the coating thickness detector further comprises a housing, a connecting wire, a display screen, a data line and a circuit board, the circuit board is arranged inside the housing, the probe is connected with the circuit board through the connecting wire, the display screen is arranged on the surface of the housing, the data line is connected with the circuit board and penetrates out of the housing, and a containing groove for placing the probe is formed in the housing.
3. The coating thickness detector according to claim 2, wherein the number of the measuring bodies is five.
4. A method of inspecting a coating thickness using the coating thickness measuring instrument according to any one of claims 1 to 3, comprising the steps of:
s1, enabling the probe to contact the surface of a coating, moving the probe, measuring the thickness of the coating once per unit distance of movement of each measuring body, generating a data point, forming a group of measuring data by all the data points generated by each measuring body, and enabling the surface area of the coating passed by the probe to be a measuring band;
s2, establishing a three-dimensional coordinate system, inputting measurement data generated by each measurement body into the three-dimensional coordinate system, wherein the X axis of the three-dimensional coordinate system is used for expressing the displacement of the measurement body, the measurement data of each measurement body are arranged at equal intervals along the Y axis direction, the Z axis is used for expressing the value of the coating thickness measured by the measurement body, connecting each group of measurement data, and generating a curved surface reflecting the coating thickness in the three-dimensional coordinate system;
and S3, introducing a first plane representing the designed thickness of the coating into the three-dimensional coordinate system, calculating the number of data points below the first plane, and judging whether the thickness of the coating is qualified.
5. The method for testing the thickness of the coating layer according to claim 4, wherein after step S3, the area S of the orthographic projection of the curved surface on the XY plane is calculated, the volume V right below the curved surface is calculated, the average thickness D of the coating layer is obtained, and the average thickness D is compared with the designed thickness of the coating layer.
6. The method for testing the thickness of a coating layer according to claim 4, wherein after step S3, at least one second plane is introduced into the three-dimensional coordinate system, the second plane is parallel to the first plane, the second plane is located below or above the first plane, the number of data points located above and/or below the second plane is calculated, and whether the thickness of the coating layer is qualified or not is judged.
7. Method for checking the thickness of a coating according to claim 6, characterized in that the second plane is at a distance from the XY-plane of three-halves of the distance of the first plane from the XY-plane.
8. The method for inspecting the thickness of a coating according to claim 4, wherein the number of the measuring zones is determined according to the area of the inspection area, and the number of the measuring zones is at least two.
9. The method for inspecting the thickness of a coating according to claim 8, wherein if a data failure of one of the measurement bands occurs in the same inspection area, a different position is selected for re-measurement in the inspection area, and if the re-measured data still shows a failure, the thickness of the coating in the inspection area is determined to be a failure and needs to be processed; if the re-measured data shows that the coating thickness in the inspection area is qualified, judging that the coating thickness in the inspection area is qualified; and if the data of two or more than two measuring belts are unqualified in the same inspection area, directly judging that the coating thickness of the inspection area is unqualified.
10. The method for testing the thickness of a coating according to claim 4, wherein the length of the measuring band is one meter, and the distance between two adjacent data points in the measuring data is 1 to 5 mm.
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Cited By (2)
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| CN113884044A (en) * | 2021-09-18 | 2022-01-04 | 华电电力科学研究院有限公司 | Intelligent detection method and detection device for wall thickness of pressure container |
| CN117685919A (en) * | 2024-02-01 | 2024-03-12 | 山东新美达科技材料有限公司 | Color-coated sheet coating thickness detection device |
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